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Phosphorus

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Articles 121 - 131 of 131

Full-Text Articles in Agricultural Science

Soil Test And Phosphorus Rate For High Rainfall Clover Pastures, Robert Summers, David Weaver Jun 2011

Soil Test And Phosphorus Rate For High Rainfall Clover Pastures, Robert Summers, David Weaver

Bulletins 4000 -

Essential information for soil testing to determine the phosphorus fertiliser requirements for clover pastures in high rainfall coastal areas of Western Australia. Includes procedures for soil sampling, tissue testing, liming, when to apply fertiliser, how to decide on the target production level, how much fertiliser is required and type of fertiliser.

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Effect Of Coal Combustion By-Products On Phosphorus Runoff From A Coastal Plain Soil, Keisha N. Johnson, Arthur L. Allen, Peter J. A. Kleinman, Fawzy M. Hashem, Andrew N. Sharpley, William L. Stout Jan 2011

Effect Of Coal Combustion By-Products On Phosphorus Runoff From A Coastal Plain Soil, Keisha N. Johnson, Arthur L. Allen, Peter J. A. Kleinman, Fawzy M. Hashem, Andrew N. Sharpley, William L. Stout

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Coal combustion by-products can lower soil phosphorus (P) solubility, but few studies have assessed their effect on runoff P. A soil with elevated P content was amended with fluidized bed combustion ash, flue gas desulfurization gypsum, and anthracite refuse ash at rates of 0–40 g kg−1 soil, and runoff from small plots was monitored over 3 years. In the first year, by-products lowered dissolved P in runoff by up to 47% below the untreated control; however, effects did not persist into the remaining years of the study. Total P losses were not significantly affected by coal combustion by-products, likely …

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Groundwater Nutrient Concentrations During Prairie Reconstruction On An Iowa Landscape, M.D. Tomer, K.E. Schilling, C.A. Cambardella, P. Jacobson, P. Drobney Jan 2010

Groundwater Nutrient Concentrations During Prairie Reconstruction On An Iowa Landscape, M.D. Tomer, K.E. Schilling, C.A. Cambardella, P. Jacobson, P. Drobney

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

One anticipated benefit of ecosystem restoration is water quality improvement. This study evaluated NO3-N and phosphorus in subsurface waters during prairie establishment following decades of row-crop agriculture. A prairie seeding in late 2003 became established in 2006. Wells and suction cup samplers were monitored for NO3-N and phosphorus. Nitrate-N varied with time and landscape position. Nondetectable NO3-N concentrations became modal along ephemeral drainageways in 2006, when average concentrations in uplands first became <10mg NO3-N L−1. This decline continued and upland groundwater averaged near 2mg NO3-N L−1 after 2007. The …

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Enzymatic Quantification Of Phytate In Animal Manure, Zhongqi He, Heidi W. Waldrip, C. Wayne Honeycutt, M. Susan Erich, Zachary N. Senwo Jan 2009

Enzymatic Quantification Of Phytate In Animal Manure, Zhongqi He, Heidi W. Waldrip, C. Wayne Honeycutt, M. Susan Erich, Zachary N. Senwo

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Phytate (inositol hexaphosphate) has been identified as a major organic phosphorus (P) form in soil, animal manure, and other environmental samples. Although a number of methods are available for quantitative isolation and determination of phytate, they are time-consuming and not amenable to routine analysis. We developed a simple, rapid method for enzymatic determination of phytate in animal manure. Animal manure was extracted by H2O, 1M hydrochloric acid (HCl), 0.1M sodium acetate (NaOAc, pH5.0) with or without 0.05M ethylenediaminetetraacetate (EDTA), and 0.25M or 0.5M sodium hydroxide (NaOH)–0.05M EDTA. Extracts were diluted (1/10–1/150) and adjusted to pH5.0 in sodium acetate …

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Epic Evaluation Of The Impact Of Poultry Litter Application Timing On Nutrient Losses, H. Allen Torbert, Thomas J. Gerik, Wyatte L. Harman, Jimmy R. Williams, Melanie Magre Jan 2008

Epic Evaluation Of The Impact Of Poultry Litter Application Timing On Nutrient Losses, H. Allen Torbert, Thomas J. Gerik, Wyatte L. Harman, Jimmy R. Williams, Melanie Magre

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Recently, changes in the utilization practices of animal manures for fertilization have been encouraged to reduce the potential of nonpoint pollution of lakes and streams from agricultural land. However, the potential impact of changing some of these practices has not been fully studied. The objective of this study was to examine the potential impact of limiting poultry litter application times on nutrient movement important to water quality. The WinEPIC model was used to simulate poultry litter applications during the winter months and chemical fertilizer application, with both cool season and warm season grass pastures on the major soil regions of …

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Effect Of Drying On Phosphorus Distribution In Poultry Manure, Heidi W. Dail, Zhongqi He, M. Susan Erich, C. Wayne Honeycutt Jan 2007

Effect Of Drying On Phosphorus Distribution In Poultry Manure, Heidi W. Dail, Zhongqi He, M. Susan Erich, C. Wayne Honeycutt

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Laboratory drying may alter manure phosphorus (P) distribution. The effects of freeze, air (22 °C), and oven (65 °C) drying on sequentially fractioned poultry manure P were examined. Higher drying temperatures resulted in lower percentage of dry matter. Increased H2O- and decreased sodium bicarbonate (NaHCO3)-extractable P with drying provided evidence that drying increases poultry manure P solubility. Labile fractions were predominantly inorganic P (Pi), whereas sodium hydroxide (NaOH) and hydrochloric acid (HCl) fractions had significant amounts of organic P (Po). Drying altered H2O- and NaHCO3-extractable Pi but …

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Levels And Changes Of Soil Phosphorus In Subtropical Beef Cattle Pastures, Gilbert C. Sigua, Mary J. Williams, Samuel W. Coleman Jan 2004

Levels And Changes Of Soil Phosphorus In Subtropical Beef Cattle Pastures, Gilbert C. Sigua, Mary J. Williams, Samuel W. Coleman

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Long-term pasture management is believed to change soil chemical properties, but little is known about whether pasture management, such as fertilizer application, grazing, or haying can initiate such change in sandy and well-drained subtropical beef pastures. The objective of this study was to investigate the long term effect of pasture management (grazing+haying, GZ+HY) on soil phosphorus (P) dynamics (levels and changes) in subtropical beef cattle pastures with bahiagrass (BG, Paspalum notatum) and rhizoma peanut (RP, Arachis glabrata) with (WP) or without (WNP) P fertilization in Brooksville, FL from 1988 to 2000. Soil P dynamics in Subtropical Agricultural Research …

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Elemental Uptake In Relation To Root Characteristics Of Tall Fescue, Glenn E. Shewmaker, Douglas A. Johnson, Henry F. Mayland, Scott A. Martin, Susie B. Hansen Jan 2004

Elemental Uptake In Relation To Root Characteristics Of Tall Fescue, Glenn E. Shewmaker, Douglas A. Johnson, Henry F. Mayland, Scott A. Martin, Susie B. Hansen

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

HiMag, an accession of tall fescue (Festuca arundinacea Schreb.), was selected for high magnesium (Mg) concentration in leaves to reduce grass tetany risk to ruminants. However, the mechanism for enhanced Mg uptake in HiMag leaves has not been determined. The objective was to investigate if increased Mg uptake in HiMag could be explained by differences in elemental distribution among plant parts, root characteristics, or organic acid concentrations compared to its parental cultivars, ‘‘Kentucky 31’’ (KY31) and ‘‘Missouri 96’’ (MO96). The study was conducted on a surface-irrigated calcareous Portneuf silt loam (coarse-silty, mixed, mesic, Durinodic Xeric Haplocalcid). Vegetation and soil …

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Bulletin No. 310 - The Influence Of Cropping On The Nitrogen, Phosphorus And Organic Matter Of The Soil Under Irrigation Farming, J. E. Greaves, C. T. Hirst Sep 1943

Bulletin No. 310 - The Influence Of Cropping On The Nitrogen, Phosphorus And Organic Matter Of The Soil Under Irrigation Farming, J. E. Greaves, C. T. Hirst

UAES Bulletins

Most soils contain sufficient nutrients for normal plant growth, with the exception of nitrogen, phosphorus and potassium. These elements are used by plants in the largest quantities and the amounts of these in the soil govern its productivity. Soil organic matter is of prime importance for it is the matrix which holds the nitrogen and modifies the structure, temperature, and water-holding capacity of the soil. The organic matter is the very life of the soil, for it is in and on it that bacteria work and by so doing determine the kind and speed of reactions which occur. It is …

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Bulletin No. 274 - Influence Of Rotation And Manure On The Nitrogen, Phosphorus, And Carbon Of The Soil, J. E. Greaves, C. T. Hirst Oct 1936

Bulletin No. 274 - Influence Of Rotation And Manure On The Nitrogen, Phosphorus, And Carbon Of The Soil, J. E. Greaves, C. T. Hirst

UAES Bulletins

All agricultural plants require carbon, hydrogen, oxygen, nitrogen, calcium, potassium, magnesium, sulfur, phosphorus, iron, and probably traces of other elements for their normal growth and fruition. The growth of farm crops is dependent upon an available supply of these elements, and the extent of growth is governed by the one present and available in least quantity in proportion to the plant's needs. Of the essential elements, all plants secure two (carbon and oxygen) from the air, one (hydrogen) from the water, and the others from the soil. Most soils contain sufficient plant nutrients for normal plant production, with the exception …

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Bulletin No. 247 - Effect Of Manure And Of Phosphorus Fertilizer On The Yield And Composition Of Alfalfa Hay, D. W. Pittman Jan 1934

Bulletin No. 247 - Effect Of Manure And Of Phosphorus Fertilizer On The Yield And Composition Of Alfalfa Hay, D. W. Pittman

UAES Bulletins

It has frequently been observed by practical stockmen that alfalfa hay produced on poor unproductive land has a much lower feeding value than hay produced on good productive land. Some have also observed that by the use of a supplemental feed rich in phosphorus (such as steamed bone-meal), the feeding value of this poor quality alfalfa hay may be improved, indicating that phosphorus deficiency is at least one cause of its low feeding value.

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